from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from config import config

db = SQLAlchemy()


def create_app(config_name):
    """程序工厂函数，根据配置生成不同的app"""
    app = Flask(__name__)
    # print('-------', config[config_name])
    app.config.from_object(config[config_name])
    config[config_name].init_app(app)
    db.init_app(app)

    # 注册蓝本
    from .main import main as main_blueprint
    app.register_blueprint(main_blueprint)
    return app
